Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 21 Jan 2003 04:28:43 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 21 Jan 2003 04:28:43 -0500 Received: from 213-187-164-3.dd.nextgentel.com ([213.187.164.3]:51422 "EHLO mail.pronto.tv") by vger.kernel.org with ESMTP id convert rfc822-to-8bit; Tue, 21 Jan 2003 04:28:42 -0500 Content-Type: text/plain; charset=US-ASCII From: Roy Sigurd Karlsbakk Organization: ProntoTV AS To: Mark Hahn Subject: Re: IDE TCQ progress? Date: Tue, 21 Jan 2003 10:37:40 +0100 User-Agent: KMail/1.4.1 References: In-Reply-To: Cc: Kernel mailing list MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Message-Id: <200301211037.40872.roy@karlsbakk.net> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > is it safe to assume you have TCQ-able drives? last time I asked > the maintainer, there were only a few WD Caviar's that did it. As specified in the config docs bool "ATA tagged command queueing (EXPERIMENTAL)" depends on BLK_DEV_IDEDMA_PCI && EXPERIMENTAL help Support for tagged command queueing on ATA disk drives. This enables the IDE layer to have multiple in-flight requests on hardware that supports it. For now this includes the IBM Deskstar series drives, such as the 22GXP, 75GXP, 40GV, 60GXP, and 120GXP (ie any Deskstar made in the last couple of years), and at least some of the Western Digital drives in the Expert series (by nature of really being IBM drives). If you have such a drive, say Y here. I've got an IBM 120GXP (IC35L060AVVA07-0) > second, what were you expecting? the kernel already schedules the head, > so the only time it should matter is if you're doing a lot of writes > in a particular sequence of block addresses in the same cylinder. I expected the kernel to be somehow stable. Not too much more. I have heard, however, that TCQ'll help a lot if connecting > 1 unit to the same IDE bus. Is this true? roy -- Roy Sigurd Karlsbakk, Datavaktmester ProntoTV AS - http://www.pronto.tv/ Tel: +47 9801 3356 Computers are like air conditioners. They stop working when you open Windows. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/